Electromagnetic device



June 9, 1925. 1,540,755'

W. O. BECK ELECTROMAGNETIC DEVICE Filed June 20, 1921 Atty Patented J une 9, 1925.

t friED fssrnmais PATENT @einen WILLIAM'O.BECK,-0F"RIDGEIIELD, NEW JERSEY, AssIGNoR TUWESTERN yELECTRIC COMPANY, "INCURPORATED, or NEW YORK, Y., A "CORPORATION ior "NEW YORK.

.Application filed/'June 20, 11921. SerialNa 479,064.

To .aZZ'w-zo/n c't. may concern: f f

fBe s it known v that WILLIAM 0. Bron, a :citizen of the United vStates, :residing 'at Ridgefield, inthe Icounty of fBergen, State of 'New-Jersey, `have invented certainnew and useful .Improvements in :Electromagnetic Devices, .of which the following :is a full, clear, concise,fand exact description.

This :invention 'relates ini'generalto electromagneticdevices and more particularly lto fa relayhavinghigh sensitivity and operable at vhigh*speeds. l '.In connection -with Uvarious :circuit arrangements, such for i example, zas th'ecircuits employed for high/speed telegraphyg 'thereris 'a demand fora relay which will operate satisfactorily with :very low `operating currents,- and "which :will fm'aintain its adjustment constantbver considerable periods of time. Since such a relayfis #not only called upon to operate with flow'operratingcurrent.va1ues,`-but `is .alsorequired to 'operate at: high speeds, it becomes necessary `to make`1the'travel ofithe vibrating member yery'small, andi't is, therefore, essentiallthat means lbe provided for insuring a very fine 'adjustment fand fmaintaining lthis adjust- -ment constant durin'gservice. Moreovento providerfsuch an adjustment it is necessary thaty a structure 'ber employed in `which there 'is nobacklashand in which' the parts are f `notsubject tofwearin such-a manner laste interfere withfthe adjustment. y

`It is, therefore, anobject ofthe present `inveifition ito Vprovide a relayfin which the kl'adjusting' mechanism lis )very sensitive, easily lmanipulated,` and not subject to chan'gesduring operation of the .device.

Itis afurther object'torprovide a struclturefin\whiclrtl1e contact members are easily accessible for the purpose of construction or repairs.I

It is a `still further object of .the invention to kprovidea simple structure in which the adjustable contacting devices may be held in positionand looked in=adjustm'ent.

vToaccomplish these objects, and fin accordance witha feature of fthe invention, 'there is provided a`relay having adjusting devices in Whichfthe parts `*are f/rigid'ly 'connectedArr to adj oining7 parts in 'such a manner asto permit no backlash for `possible movement duel to wear of the parts. lIn iaccord- 4ance `with another feature of the invention, ithecontact screws 'are mounted "onfarpivot plate, andlexibleconnections are provided so-thatfthesplate may be swungout of alignment with the armature to permit cleaning or inspection .of the contacts. In accordance with anotherfeatureof .the invention, mean-s yis provided for simultaneously locking the contact yscrewsfandsupportin-g plates iny -ositin.

lese gandother featuresof theinvention will kbe moreclearlyunderstood by reference to .the accompanying drawing inwhich .Fi'ggl is a perspective "viewof a relay embodying the vfeatures ofthis inventiony-Fig. 2 lis a -view in perspective showing more clearly the-.methodemployed for'adjusting;

Yand (Fig. 3 :is a cross-sectional view taken along the line 3--3-0f IFig. 1, showing the mannerfin whichthe contact screws are held yiny place.

Referring `now 1to the drawing, there is .provided'a basel() offhard rubber or similar insulating material, upon which is se- Jcuredea metal mounting plate 11. Secured to this .plate,by'means of'screws 12, l12, but

insulated.therefrom: by means of plates 13 and :bushings l14C of insulating material, is 'a Ysupporting member '15' of non-magnetic material. lSecured to the central portion of this "member is a polarizedrelayfofther general ytype described in detail in Patent' 1,339,778,consis'ting essentiallyof a polarized -magnet 16, adjustable pole pieces `17,

17,1armature .18,fand oper-atii coils 19, v19. .The 'Y upper s portion of'zthe` mem er 15 'is zpro- -videdat with an offesetportion to receive the segment 21,':which fis.preferablyof phosphor bronze -fo'r "hard spring `.brass fand lis -rigidlysecuredivtothe member '1'5 by means 4of .screws 22,122. The Lsegment 21 vis slotted `asfshown:inFig. 2, to-provide atri-angular shaped :portion 23, separated ffrom the main. kportion by means of 4a ytongue portion 24 of 'restricted .crossesection 'to "obtain {propelflexure. Rigidl-y secured "to athe 'triangular portionifby means of screws 25,is ia .plate memberQG upon'which .the ysupport 27 is Irigidly supported. Pivotally vsecured 'to I"this :support f by means .of athe pivot screws l 28,28, isfthefbridge 'memberi29,1upon which :are 4Imounted contact .posts "30, 30. These fposts, which 'are provided with "horizontal slots and I threaded 2te i'receive kthe `contact screws 34,' 34, are insulated from .the lbridge member by meansxof v.insulating :plates :31, :'31 and are held fin lposition fby :means nf'fthe screws 32 and 33. The screws 33 are arranged to engage suitable threads in the posts below the slots but to pass freely through the portions above the slots. Internally threaded caps or nuts 35, provided with shouldered heads, are adapted to engage the threaded portions of screws 33 and serve the double purpose ot locking the screws 33 in position and also the adjusting screws 34, 34, thus eliminating the necessity for additional locking screws. The plate 26 is provided with an opening 36 through which extends the 'armature 18, and suitable oblong slots 37, 37 are provided through which pass the insulated conductors 38 leading to the screws 33. During operation, the bridge member 29 is held in the proper position so that the contact screws are in alignment with the contact points of the armature by mea-ns ot distance pins 39, 39, and a shouldered locking screw 40. lVhen it is desired to inspect the contact points, the screw 40 may be loosened and the bridge member rotated about the pivot screws 28, 28, throwing the bridge members in a vertical position and thus lea-ving all the members open for inspection.

Passing through suitable bearings 41 in member 15 is a vertical shaft 42, which is provided at its upper end with a cam shaped collar 43 engaging a roller 44, rotating about a trunnion screw 45 secured in the plate member 26. At the lower end ot shaft 42, there is provided a lever 46 having a right-angled pin 47 extending therefrom. The lever 48, pivotally secured to the plate 11 by means of the screw 49, is provided with an insulated section 50 which is adapted to engage the pin 47. These parts are held in continual engagement by means of the spring 51, which is secured between the pin 47 and a second pin 52 rigidly secured to plate 11. The knurled head adjusting screw 53 passes through a suitable opening in the base 10 and its threaded portion is adapted to engage with the threads of a post 54, which is rigidly secured to the plate 11. The end of adjusting screw 53 engages with lever 48 which, in turn, engages pin 47 of lever 46 and thus causes the rotation ot shaft 42. Upon the rotation of shaft 42, due to turning of adjusting screw 53, the cam portion 43 actuates the roller 44, causing a iiexure ot the tongued portion 24, thus ei'ecting a lateral movement to the plate 26 with respect to the supporting member 20. By this arrangement, although the various parts are rigidly connected together, there is suiiicient tlexure to permit the plate 26 being rotated an amount suthcient to provide the necessary movement between the contact screws 34, 34 and the armature 18. Suitable binding post terminals 56, 56 are provided in the base member 10, to which are connected the various windings of the coils 19, 19, the contact screws 34, 34, and the armature 18. The adjusting screw 53 is preferably provided with marking as shown to designate the direction for turning to increase the length of the mark or space when the relay is operated in connection with recording apparatus employing a tape.

It will be noted that the structure, as described, eliminates backlash and docsnot contain any parts which, due to wear, could in any way cha-nge the adjustment of the device. Furthermore, the biasing adjustment does not change the distance between the contact screws 34, 34 when these screws are once properly positioned, thus dillering from the constructions ordinarily employed in which biasing is obtr ined only by moving both adjusting screws an equal amount. lilith a device ot this type, it has been found possible to obtain an adjustment which is extremely sensitive and accurate and which is maintained in service in spite of the continual vibrations due to the operation ol the armature. Vhile in service a dustproof cover is provided to fit upon the base 10 outside the plate 11, and is held in position by means of lugs in order to avoid confusion; this cover is not shown in theY drawing.

f That is claimed is:

1. An electromagnetic device comprising an operating coil, a support therefor, an armature, a contact member engaged by the operation of said armature, a support for the contact member, and contact adjusting means including a plate member rigidly connected to each of said supports but having a tlexible portion to permit movement of the supports with respect to each other.

2. An electromagnetic device comprising an operating coil, a support therefor, an armature, a contact niembcr positioned on either side of and adapted to be engaged by the operation oi' the armature, a support for said Contact members, said support being pivotally mounted to rotate clear ot the armature, and adjusting means for adjusting the position ot said contacts with respect to the armature without changing the separation between the contact members.

3. An electromagnetic device comprising an operating coil, a support therefor, an armature, a contact member engaged upon the operation ot said armature, a support for the contact member, said support being pivotally mounted to rotate vertically about a horizontal axis, means Jfor adjusting the position ot' the contact members with respect to the armature, and additional means rigidly connected to the contact support for further adjusting the position of the contact member with respect to the armature.

4. An electromagnetic device comprising an operating coil, a support therefor, an

Li l) arnlaturc, a pair of Contact members mounted upon the opposite sides of and adapted to be engaged by the operation of the armature, a support for the contact members, said support being pivotally mounted to rotate vertically about a horizontal axis, means `for adjusting the position of each contact member with respect to the armature, and additional means rigidly connected to the contact support for further adjusting the position of the Contact members with rcspect to the armature without changing the separation between said contact members.

f 5. A relay comprising an electromagnet, an armature therefor, a supporting memberfor the electromagnet, a contact member engaged by the operation of the armature, a supporting member for the contact member, said supporting member being pivotally mounted to rotate vertically about a horizontal axis, and means for adjusting the position of the contact member with respect to the armature, said adjusting means being rigidly connected to each of said supporting members but providing a flexible connection therebetween.

6. A relay comprising an electromagnet, an armature therefor, a support for the electromagnet, a contact member engaged by the operation of the armature, a supporting plate for the contact member, an intermediate member rigidly secured to each of said supporting members, and means for causing the flexure yof said intermediate member.

7. A relay comprising an electromagnet, an armature therefor, a support for the electromagnet, a Contact member engaged by the operation of the armature, a supporting plate for the Contact member, an intermediate member having its central portion joined to its outer portion by a tongue portion o'f restricted cross-section, the outer portion of this member being connected rig idly to the electroniagnet-supporting member, the inner portion being connected rigidly to the contact supporting member, and means for causing the lexure of said intermediate memberat the restricted portion.

8. A. relay comprising an electromagnet, an armature therefor, a support for said electron'iagnet, a pivoted arm carrying a ypair of opposed contacts adapted to be engaged in alternative positions of the armature, said arm being mounted so that .it may be swung clear of the armature and again swung back-into operating position 'ithout destroying the adjustment of said contacts.

9. A relay comprising an electromagnet, an armature therefor, a contact member adapted to be engaged by the operation of the armature, a contact screw, a contact plate having a horizontal slot therein provided with a threaded portion to engage said contact screw, means for securing the contact plate to a supporting member, and means for simultaneously locking the securing means for said contact plate and clamping the contact screw in the clamping plate.

10. An electromagnetic device comprising an operating coil, a support therefor, an armature, a contact member engaged upon the operation of said armature, a supporting plate for said contact member, a flexible intermediate member rigidly connected to said plate and to the support, a shaft rotatably mounted in said support and having a cam at one end adapted to engage a roller ro` tatably mounted upon said plate, and means for causing the rotation of said shaft to alter the position between the contact member and the armature.

In witness whereof, I hereunto subscribe my name this 16th day of June, A. D. 1921.

TILLIAM O. BECK. 

